Add example for reading text from a file

[c-martinez]

Is this good enough to address #576 ?

[codecov-io]

Codecov Report

Merging #1725 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1725   +/-   ##
=======================================
  Coverage   98.67%   98.67%           
=======================================
  Files          48       48           
  Lines        2561     2561           
=======================================
  Hits         2527     2527           
  Misses         34       34           

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[stale]

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